基于精油的缓蚀剂对铝合金缓蚀性能的评估
Evaluation of Corrosion Inhibition of Essential Oil-Based Inhibitors on Aluminum Alloys.
作者信息
Sanni Omotayo, Iwarere Samuel A, Daramola Michael O
机构信息
Department of Chemical Engineering, Faculty of Engineering, Built Environment and Information Technology, University of Pretoria, Hatfield, Pretoria0028, South Africa.
出版信息
ACS Omega. 2022 Nov 4;7(45):40740-40749. doi: 10.1021/acsomega.2c00540. eCollection 2022 Nov 15.
There is a high demand for eco-friendly, effective, and high-performance corrosion inhibitors for industrial applications. Thus, the corrosion property of aluminum alloys was studied in essential oil-containing sodium chloride solution at various concentrations. Potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), surface tests, and weight loss analysis were used to study the corrosion inhibition mechanism of the essential oil. The essential oil showed the highest inhibition efficiency of 97.01% at 1000 ppm. A high efficiency of 96.03% was achieved even after 168 h of exposure. The potentiodynamic polarization test showed that the essential oil is a mixed-type inhibitor. EIS results show better adsorption of the oil on the surface of the aluminum at increased inhibitor concentrations. The Langmuir's adsorption isotherm model was found to describe the adsorption behavior. The surface morphology of the uninhibited and inhibited specimens examined by a scanning electron microscope equipped with an energy-dispersive X-ray spectroscope confirmed the protective film of the inhibitor molecules on the aluminum surface.
工业应用对环保、高效且高性能的缓蚀剂有很高的需求。因此，研究了铝合金在不同浓度含精油氯化钠溶液中的腐蚀性能。采用动电位极化、电化学阻抗谱（EIS）、表面测试和失重分析来研究精油的缓蚀机理。该精油在1000 ppm时显示出最高97.01%的缓蚀效率。即使在暴露168小时后仍实现了96.03%的高效率。动电位极化测试表明该精油是一种混合型缓蚀剂。EIS结果表明，随着缓蚀剂浓度增加，精油在铝表面的吸附效果更好。发现朗缪尔吸附等温线模型可以描述吸附行为。用配备能量色散X射线光谱仪的扫描电子显微镜检查未加缓蚀剂和加了缓蚀剂的试样的表面形貌，证实了缓蚀剂分子在铝表面形成的保护膜。
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